import serial
import tkinter
arduinoData = serial.Serial('com8',9600)
def led_on():
    arduinoData.write(b'1') # write (b'1')
def led_off():
    arduinoData.write(b'0') # write (b1)
led_control_window = tkinter.Tk()
button = tkinter.Button(led_control_window, text="led on", command=led_on)
button2 = tkinter.Button(led_control_window, text="led off", command=led_off)
button.grid(row=0, column=1)
button2.grid(row=1, column=1)
led_control_window.mainloop()